Dwell-motion mechanism



April 21, 1925.

' W. S. WELLS DWELL MOTION MECBANISM Filed July 7. 1924 "ATTOREV Patented Apr. 21, 1925.

UNITED STATES PATENT @FHQE.

WILLIAM S. WELLS, 0F BETHLEHEM, PENNSYLVANIA, ASSIGNOR TO BENJAMIN EAST- WOOD COMPANY, OF PATERSQN, NEW JERSEY, A CORPORATION OF NEW JERSEY.

DW'ELL-MQTION MECHANISM.

Application filed July '7,

To all whom it may concern:

Be it known that 1, 1min: S. TELLS, a citizen or the United States, residing at Bethlehem, in the county of Lehigh and titate oil? Pennsylvania, have invented certain new and useful Improvements in Dwellhlotion Mechanisms, oi which the following a specification.

This invention relates to dwell-motion mechanisms for obtaining at different intervals of; time, according to the requirements of a suitable pattern mechanism, the motion (usually first one way and then the other) o l a structure to be moved. as the shuttlelJQX structure of a loom. V For this purpose there are usually en'lployed a driving rotary gear rotating at constant speed, a driven gear ci'innected eccentrically, as by a pitinan, with the structureto be moved and having spaced peripheral. toothed segments, and pattern-controlled means to shift one of the gears laterally into and out of the plane of and hence into or out of position tor meshing with the other gear. The object of this invention to provide the gears with means which, during the whole extent of the period represented by the working part of the cycle of the driving gear, will insure against the laterally shittahle gear shitting from one to the other of its positions, which would produce a smash or am, or assuming a partially shifted position, with consequent incon'iplete meshing of the gears and possible stripping oi. their teeth.

In the drawing,

Fig. 1 is a side elevation of the improved mechanism, with the upper partof the case in section;

Fig. 2 is a plan, with the upper part or cover of the case removed;

Fig. 3 is an end elevation, partly in section; and

l ig. 4.- shows the driving gear, in. odgewisc (lQVttlllOlL The case formed in two counterpart halves (a a, upper and lower, the upper part (7,. of which may he here taken as the cover. This case receives the end portions of two shafts, 7) and c, the former of which is the drive shaft and the latter the driven shaft.

011 the drive-shaft is fixed a driving gear cl arranged eccentrically on the shaft and having a series of teeth at the extreme portion of its periphery which are set in an arc concentric to its axis; all the teeth cl of this 1924. Serial No. 724,598.

series are plain but one end one, (Z is elongated as shown. Forward (in the direction of rotation of the gear-arrow, Fig. 1)- ol? the teeth the gear has a switching portion which tapers i'orward to a hni'i e-edgecl Fig. that is here in the central plane of the gear.

On the shaft 0 is fixed a collar e which is recessed, at c, at the front to term a housin and which has two opposite peripheral notches 0 These are adapted to receive a holding device to he explained. The rear or exposed end oi"- the shaft has a crank to which the pitman g for imparting the motion, to the box or other structure to he moved is pivotally connected. ()n the sluitl c is the driven gear hhaving two oppi'isite identically similar series of ieripheral teeth all the teeth 71. in each series are plain hut one end one, If, iselongated as shown. The teeth of each oi these series,it will be understood, are adapted to mesh ith the teeth of the gear (Z and the tooth (Z is adapt-ed to in'ipinge against one or the other of the teeth 7L it will he also understood, and since tooth (Z coactsin this way with one oi": the teeth 7& at a time when the driven gear in a state of rest these teeth are all made longer so as to withstand the incidental shock. At its front side the gear it has a peripherally proj ecting continuous flange or knife 71. beveled to a knife-edge and flanking its teeth. Gear h is in efi'ect splined to shaft 0 by two studs 5 which project from collar 0, parallel with the shaft, through the gear. The gear is normally urged to the front (right in Fig. 3) by a spiral spring contained in housing 0, in which position it would mesh with gear (Z; when shifted to the rear (Fig. 2) gear 7?. stands clear of the path 01 movement of gear A lever 77, subject normally to the pressure of a spring Z housed in the cover at oi the case holds the gear 71. in the position last stated, acting tor this purpose through a sliding pin m, arranged in said cover, and a. washer or wear-disk 1i abutting the gear. This lever is connected with. pattern mocha uism (not shown) by the connection 0.

The flange k overlaps the teeth oi the gear cl when the two gears mesh. Hence the gear 7L can be shifted laterally only when the low part of gear 66 adjoins the gear 7:.

Bearing on the periphery of collar e is a roller 12 on a holding lever p fulcrunied in the cover and subject to the pressure oi. a

l lll all spring lVhen the roller is seated in either notch e the shaft 0 will be held at standstill so long as the gears do not mesh.

Operation: According to the call of the pattern mechanism operating through connection 0, the gear it will be held either in position to be rotated by gear (Z or out of such position (as in Fig. 2) and in the first position it will be turned a half-revolution at a time, thus to shift the box structure, and be held at dwell by the holding device 2) between its movements. The extent of intervals or dwells between movements of gear It will depend on the call of the pattern mechanism. The gear 71, through any fault in the means controlling its position, cannot shift from one to the other of its positions (which would cause a smash or jam in the loom or other machine controlled) when the gear (Z is approaching or is in the working part of its cycle, since the flange of gear hthen flanks the teeth of gear d; further, the gear it. cannot through any fault in the controlling means remain otherwise than fully in or fully out of register with gear (Z, since the switch (Z will cam it one way or the other if it assumes a position intermediate its shifting limits. Thus there is no possibility of stripping the gears.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A dwell-motion mechanism, including, with supporting means, a peripherally toothed driven rotary gear, an eccentric driving rotary gear having its axis parallel with that of the first gear and the high part of its periphery toothed and adapted to intermesh with the toothed periphery of the first gear, one gear being shit'tablc laterally into and out of the plane of the other to permit such intermeshing, and means to shift the shiftable gear into and out of said plane, the first gear having a peripherally projecting flange flanking its teeth and arranged to flank the teeth of the other gear and obstruct such shitting when in the rotation of the second gear the toothed high part thereof adjoins the first gear.

2. A dwell-motion mechanism, including, with supporting means, a peripherally toothed driven rotary gear, an eceentrio driving rotary gear having its axis parallel with that 01 the first gear and the high partoi its periphery toothed and adapted to intermesh with the toothed periphery of the first gear, one gear being shittable laterally into and out of the plane of the other to permit such intermeshing, and means to shift the slii'ttable gear into and out of said plane, the first gear having a peripherally projecting flange flanking its teeth and arranged to flank the teeth of the other gear and obstruct such shitting when in the rotation of the second gear the toothed high part thereof adjoins the first gear, and the second gear having a switching portion rotatively in advance of its teeth and arranged to wipe laterally against said flange to cam the first gear laterally.

In testimony whereof I aflix my signature.

lVILLIAM S. \VELLS. 

